You can manually grant access to a subscription, content, or bundle for customers. Granting access to bundles or content will provide access for free. Granting access to a subscription plan will provide free access until the next due date.
Navigate to the person you want to grant access for under People > People and click Edit. Then click the Access tab and you'll see three tabs here: Subscriptions, Content, and Bundles. Remember, bundles and content that are granted manual access are provided free while subscriptions are free until the next invoice date.